I seem to recall the similar Grunding of my parents back in the mid 50's had a row of 5-6 knobs at bottom center which controlled various audio frequency bands. The visual indications were small beads tied together with red elastic strips behind the glass panel. As the knobs were adjusted the beads moved up or down about 1-2 cm, the elastics stretched and followed to form a mechanical visual display of the resulting frequency resonse.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.